Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6e5fed7a102780…

MALICIOUS

PDF

74.2 KB Created: 2020-12-18 12:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 78d6b794c54bae52d4b51b58ca6d6f71 SHA-1: 9b2c9c9296cb36c1f13bafb9edfee33f9ebe3be4 SHA-256: 2c6e5fed7a1027802da067600a222cefd299bf5b01b878e51f30540e62ec7d20
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL points to a link farm hosted on Weebly, which in turn links to numerous other PDFs. While no scripts were directly extracted, the nature of the link farm suggests a malicious intent, possibly for SEO manipulation or to distribute further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffe.ru/strik?utm_term=594+bus+schedule+north PDF link annotation
    • https://fazotevepokok.weebly.com/uploads/1/3/4/8/134865813/juwajutake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5fd188a1a5a2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5f93ab34e0ae6.pdfIn PDF document text
    • https://fegunase.weebly.com/uploads/1/3/4/6/134603704/8201064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_5fb85af3d0b66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498868/normal_5fdb0c6e2e188.pdfIn PDF document text
    • https://vifefafu.weebly.com/uploads/1/3/4/8/134876142/4979808.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/487192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f88586a8084d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb2c885-c5b5-4d2a-9ea4-a9c59189905b/30912168698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/762a9add-1fe9-4d6d-9d36-f473b10c3887/standard_crackers_price_list_2014_pd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291be678-eabc-41f6-b499-a27c57d4efe8/5125834625.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 5228 bytes
SHA-256: 65136ab4c14f86618ca1ccdf79e5315e332d67d2009fb1500c93368534e6e059
font_02_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 12452 bytes
SHA-256: 86746466ec974f4bfabc87f21cad6d6e4268e7a6200430f8d1a37b0376bd10cb

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